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Appl. Sci. 2018, 8(7), 1129; https://doi.org/10.3390/app8071129

Full Characterization of a Molecular Cooper Minimum Using High-Harmonic Spectroscopy

1
Department of Physics, The Ohio State University, Columbus, OH 43210, USA
2
Department of Physics and Astronomy, Louisiana State University, Baton Rouge, LA 70803, USA
3
Department of Physics, University of Virginia, Charlottesville, VA 22904, USA
*
Author to whom correspondence should be addressed.
Received: 14 June 2018 / Revised: 6 July 2018 / Accepted: 9 July 2018 / Published: 12 July 2018
(This article belongs to the Special Issue Attosecond Science and Technology: Principles and Applications)
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Abstract

High-harmonic generation was used to probe the spectral intensity and phase of the recombination-dipole matrix element of methyl chloride (CH3Cl), revealing a Cooper minimum (CM) analogous to the 3p CM previously reported in argon. The CM structure altered the spectral response and group delay (GD) of the emitted harmonics, and was revealed only through careful removal of all additional contributors to the GD. In characterizing the GD dispersion, also known as the “attochirp” we additionally present the most complete validation to date of the commonly used strong-field approximation for calculating the GD, demonstrating the correct intensity scaling and extending its usefulness to simple molecules. View Full-Text
Keywords: molecular high-harmonic generation; high-harmonic spectroscopy; cooper minimum; methyl chloride; methane molecular high-harmonic generation; high-harmonic spectroscopy; cooper minimum; methyl chloride; methane
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Scarborough, T.D.; Gorman, T.T.; Mauger, F.; Sándor, P.; Khatri, S.; Gaarde, M.B.; Schafer, K.J.; Agostini, P.; DiMauro, L.F. Full Characterization of a Molecular Cooper Minimum Using High-Harmonic Spectroscopy. Appl. Sci. 2018, 8, 1129.

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